Sandmeyer
National Hazard
Posts: 784
Registered: 9-1-2005
Location: Internet
Member Is Offline
Mood: abbastanza bene
|
|
Basic Laboratory Techniques
Here follows a collection of videos covering essential lab techniques. Files were originaly posted to a russian board by Scienthesis.
Basic Laboratory Techniques (50.8 mb)
Drying an Organic Solution
Extraction
Fractional Distillation
Heating and Refluxing
Recrystallization
Simple Distillation
Simple Filtration - Fluted Filter Paper
Simple Filtration - Prepare the Fluted Filter Paper
Use of Rotary Evaporator
Vacuum Distillation
Vacuum Filtration (Suction Filtration)
http://rapidshare.de/files/10153321/Basic_Laboratory_Techniq...
When rapidshare dosen't work there is a bit slower alternative:
http://www.megaupload.com/?d=XTOK2FQ1
Laboratory Safety (1,95 MB)
Handling of Chemical Spills - Spill Kit
Use of Emergency Eyewash
http://rapidshare.de/files/10153424/Laboratory_Safety.rar.ht...
or
http://www.megaupload.com/?d=OZG3R9SA
These, as well as videos on other topics in practical organic chemistry can be selected from left frame in the following link:
http://www.chem.cuhk.edu.hk/lab_technique.asp
|
|
|
Darkblade48
Hazard to Others
Posts: 411
Registered: 27-3-2005
Location: Canada
Member Is Offline
Mood: No Mood
|
|
That's interesting, I have a similar page with almost exactly the same techniques, but it's from the Department of Chemistry, from the University of
Hong Kong.
http://www.chem.cuhk.edu.hk/lab_technique_2basic.htm
The video itself is in Chinese, but it has English captions.
|
|
|
The_Davster
A pnictogen
Posts: 2861
Registered: 18-11-2003
Member Is Offline
Mood: .
|
|
Another Universities Lab techniques page :
http://www.chem.ualberta.ca/~orglabs/videos/Videos.htm
|
|
|
chromium
Hazard to Others
Posts: 284
Registered: 27-6-2005
Member Is Offline
Mood: reactive
|
|
Thanks for video links! Those are very usefull (for me at least). Does anyone know more of such web sites?
[Edited on 1-1-2006 by chromium]
|
|
|
Magpie
lab constructor
Posts: 5939
Registered: 1-11-2003
Location: USA
Member Is Offline
Mood: Chemistry: the subtle science.
|
|
fluting filter paper
Darkblade I watched the video on paper fluting and it is the only instruction I've seen that gives a truly symmetrical 16 section flute. The trouble
is your little buddy is too fast and I can't follow her moves. Happy New Year anyway. Now go out and set off some firecrackers. 
edit: ...ahem, I watched the 250K version and it is much better (sorry).
[Edited on 1-1-2006 by Magpie]
The single most important condition for a successful synthesis is good mixing - Nicodem
|
|
|
Darkblade48
Hazard to Others
Posts: 411
Registered: 27-3-2005
Location: Canada
Member Is Offline
Mood: No Mood
|
|
It's very difficult in trying to describe how to properly flute a piece of filter paper, but it's kinda like origami. Really, all you are doing is
folding the little circle into quarters and then lifting one of the quarters up and then "flattening" it....
It's hard to describe, but once you get the hang of it, it's actually quite simple to do, and it makes (gravity) filtration a lot easier.
|
|
|
The_Davster
A pnictogen
Posts: 2861
Registered: 18-11-2003
Member Is Offline
Mood: .
|
|
I think I learned fluted paper from vogel, it took me a few tries to get it right. It gives pretty even flutes, except for a smaller one on each
side.
|
|
|
12AX7
Post Harlot
Posts: 4803
Registered: 8-3-2005
Location: oscillating
Member Is Offline
Mood: informative
|
|
Usually, when I want to fold some paper I just fold it twice, evenly (starting with a square, fold it in half, then fold the length in half, yielding
a four layer square of half the dimensions of the original square), then open the top layer. Bending it out finds a 45 degree cone, with a lot of
waste around the sides yes but it's quick.
If I'm feeling unusually lazy I just moisten it then push it into the jar I'm filtering into... viola, auto fluted paper... LOL 
Tim
|
|
|
Magpie
lab constructor
Posts: 5939
Registered: 1-11-2003
Location: USA
Member Is Offline
Mood: Chemistry: the subtle science.
|
|
I practiced on 5" circles of paper yesterday starting with procedures in my lab manuals. Both of these gave a 16 sector flute but with the two
"boxes." While serviceable these lack elegance.
The Hong Kong demo at 250K is quite good and gives a 16 sector flute without the 2 "boxes." With a little practice anyone can do it. 
The single most important condition for a successful synthesis is good mixing - Nicodem
|
|
|
thalium
Hazard to Others
Posts: 123
Registered: 2-11-2004
Location: Bottom of Hell
Member Is Offline
Mood:
|
|
I made it!!! 16 sector flute, no boxes
I don\'t believe in ghosts but they believe in me
Hell was full so I came back.. |
|
|
Darkblade48
Hazard to Others
Posts: 411
Registered: 27-3-2005
Location: Canada
Member Is Offline
Mood: No Mood
|
|
What boxes are we speaking of? Everytime I flute my filter paper, I get a neat 16 sectionned fluted piece of filter paper with triangles
Maybe it's just because I've practiced on a lot of pieces of paper first
|
|
|
Magpie
lab constructor
Posts: 5939
Registered: 1-11-2003
Location: USA
Member Is Offline
Mood: Chemistry: the subtle science.
|
|
As you say it is hard to put into words.
Fold it with 16 equal sectors to form a fan. From an end view it will have a perfect 8-sided zig-zag. When opened there are 2 boxes.
The single most important condition for a successful synthesis is good mixing - Nicodem
|
|
|
The_Davster
A pnictogen
Posts: 2861
Registered: 18-11-2003
Member Is Offline
Mood: .
|
|
Tip: fold those boxes in, you get a couple of smaller flutes. It is the way I learned it out of the book I learned it from.
[Edited on 4-1-2006 by rogue chemist]
|
|
|
Magpie
lab constructor
Posts: 5939
Registered: 1-11-2003
Location: USA
Member Is Offline
Mood: Chemistry: the subtle science.
|
|
Yes, rogue, I've seen this technique also. It has the advantage of being much faster than the perfect Hong Kong fold.
The single most important condition for a successful synthesis is good mixing - Nicodem
|
|
|
![[*]](images/xpblue/default_icon.gif){kind=icon}
